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Magnetic tunnel junction field sensors with hard-axis bias field

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3 Author(s)
Liu, Xiaoyong ; Department of Physics, Brown University, Providence, Rhode Island 02912 ; Ren, Cong ; Xiao, Gang

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We have fabricated and studied the magnetic properties of the Ni81Fe19/Al2O3/Ni81Fe19 based magnetic tunnel junction sensors. Magnetoresistance (MR) of 35% is achieved with a small applied field (≪10 Oe). The introduction of a hard axis bias field linearizes the MR response. The hysteresis disappears in hard-axis fields greater than 3 Oe, which corresponds to the effective anisotropy field along the easy axis. A sensitivity of 3.5%/Oe has been demonstrated in this linear region. Low-frequency noise measurements indicate that sensor noise is dominated by field-dependent 1/f noise caused by magnetization fluctuations. Finally, a noise level as low as 1 nT/Hz1/2 has been obtained. © 2002 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:92 ,  Issue: 8 )

Date of Publication:

Oct 2002

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